160 BRASSIACEAE. 



6. Erysimum oblanceolatum Rydb. In the mountains of Wyo. and Colo. — 

 Alt. sooo-i 1,000 ft. — Golden; near La Plata Post Office; Hamor's Lake, above 

 Durango; Williams' Canon; near Pueblo; Georgetown; Stove Prairie Hill; 

 Cameron Pass; Dixon Cafion; plains and foot-hills near Boulder; Alpine 

 Tunnel; Cimarron. 



7. Erysimum Bakeri (Greene) Rydb. (Chieranthus aridus Greene; C. 

 Bakeri Greene) On dry hills in Colo, and N. M. — Golden City. 



8. Erysimum argillosum (Greene) Rydb. (C argillosus Greene) On dry 

 mesas and bluffs of Colo. — Alt. about 5000 ft. — Pueblo; plains near Denver; 

 bluffs north of La Porte. 



g. Erysimum nivale (Greene) Rydb. (C nivalis Greene) In the higher 

 mountains of Wyo. and Colo. — Alt. 11,000-13,000 ft. — Mountains northeast 

 of Boreas ; mountains above Graymont ; mountain northwest of Como ; above 

 Ouray; Carson; Argentine Pass; Mt. Hesperus, above timber hne; Slide 

 Rock Canon; West La Plata Mountains. 



10. Erysimum radicum Rydb. On the higher peaks of Colo. — Alt. 10,000- 

 13,000 ft. — Pike's Peak; Bottomless Pit. 



11. Erysimum Wheeleri S. Wats. (£. asperum alpestre Cockerell) On 

 dry hills and plains in the mountains from Colo, and Utah to Tex. and Ariz. 

 — Alt. 5000-12,000 ft. — Mountains between Sunshine and Ward; plains and 

 foot-hills near Boulder; East Indian Creek; Turkey Creek and tributaries; 

 Veta Mountain; Ojo; west slope Bald Mountain; Slide Rock Caiion, West 

 La Plata Mountains; foot-hills near Ft. Collins; mountains near Veta Pass; 

 headwaters of Pass Creek; Horsetooth Gulch; Howe's Gulch; Montrose; 

 Dillon Caiion; Chicago Lakes; near Boulder. 



12. Erysimum amoenum (Greene) Rydb. {Cheiranthus nivalis amoenus 

 Greene.) On the higher peaks of Colo. — Alt. 10,000-13,000 ft. — ^La Plata 

 Mountains ; Silverton ; near Ironton, San Juan Co. ; Mt. Abram ; mountains 

 near Ouray; Berthoud Pass. 



17. BARBAREA L. Winter-cress, Scurvy-grass. 



Pods sharply 4-angIed, stout-pediceled ; leaf-segments 4-8 pairs. 1. B. praecox. 

 Pods obtusely 4-angled ; leaf-segments 1-4 pairs. is. B. americana. 



1. Barbarea praecox (J. E. Smith) R. Br. In waste places from N. Y. 

 to Wash., Fla. and Calif. ; sparingly introduced from Europe.— Hotchkiss. 



2. Barbarea americana Rydb. {B. vulgaris gracilis S. Wats.; not DC.) 

 In rich soil from Sask. and Mont, to Colo, and Nev.-»Between Eldora and 

 Baltimore. 



18. SINAPIS L. White Mustard. 



I. Sinapis alba L. Introduced in grain fields and waste places from Me. 

 to B. C. and Calif. — Ft. Collins. 



ig. BRASSICA L. Wild Mustard, Turnips, Cabbage. 



Pedicels 1-2 cm. long; plant glabrous. i. B. juncea. 



Pedicels about 5 mm. long ; plant sparingly hispid. 2. B. arvensis. 



I. Biassica juncea (L.) Coss. Sparingly introduced from Europe; in 

 waste places from N. H. to Colo., Va. and N. M. — Alt. about 8000 ft. — Hills 

 about Box Cafion, west of Ouray. 



